Method and circuit configuration for determining the pedal force as a control quantity for a brake system with anti-lock control
AssigneeITT Automotive Europe GmbH
InventorsIvica Batistic, Axel Christen
Life of this patent
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Abstract
To determine the pedal force as a control quantity for a brake system with anti-lock control, the drive motor of a hydraulic pump is switched over to generator operation during braking with anti-lock control, and the magnitude of the generator voltage and its fade-out behavior is evaluated. The hydraulic pump serves to return the pressure fluid which was discharged from the wheel brake for pressure reduction, or it serves for the supply of auxiliary pressure. The approximate supply pressure depending on the pedal force can be determined by the generator voltage and the fade-out behavior.
Claims16
A circuit configuration for a brake system of a vehicle having anti-lock control for determining the pedal force as a control quantity during braking of the wheels of the vehicle, said circuit configuration comprising:
- sensors for indicating the rotational behavior of the wheels of the vehicle;
- an hydraulic pump assembly having a drive motor which serves at least as one of:
- (a) a pressure fluid return, and
- (b) a source of auxiliary pressure fluid;
- an electronic controller circuit for:
- (a) evaluating the wheel rotational behavior of the wheels of the vehicle,
- (b) generating braking pressure control signals, and
- (c) actuating said drive motor;
- and
- a measuring circuit for:
- (a) switching said drive motor over to generator operation for a predetermined period of time,
- (b) measuring the magnitude and the fade-out behavior of the voltage of said drive motor during said predetermined period of time,
- (c) evaluating the magnitude and the fade-out behavior of the voltage of said drive motor during said predetermined period of time for determining an approximate supply pressure, and
- (d) supplying an indication of the supply pressure to said electronic controller circuit.
A method for determining the pedal force as a control quantity during braking with anti-lock control, for a brake system with anti-lock control which includes an electromotively driven hydraulic pump for the return of pressure fluid discharged from the wheel brakes during braking pressure control or for the generation of auxiliary pressure, characterized in that, during braking with anti-lock control, a drive motor of the hydraulic pump is switched over to generator operation for a predetermined time for measuring the supply pressure, and the magnitude of the generator voltage and the variation or fade-out behavior of the generator voltage is assessed to determine in approximation the supply pressure as a function of the pedal force.
A method for determining the pedal force as a control quantity during braking with anti-lock control, for a brake system with anti-lock control, said method comprising the steps of:
- providing a hydraulic pump assembly having a drive motor for at least one of:
- (a) returning pressure fluid discharged from wheel brakes of the vehicle during braking pressure control, and
- (b) generating auxiliary pressure;
- switching said drive motor to generator operation for a predetermined period of time during braking with anti-lock control;
- measuring the magnitude and the fade-out behavior of the voltage of said drive motor during said predetermined period of time;
- and
- assessing the variation and fade-out behavior of the voltage of said drive motor during said predetermined period of time to determine an approximate supply pressure as a function of the pedal force.
Dependencies are inferred from the claim text.